clk: rockchip: use separate compatibles for rk3288w-cru

Commit 1627f683 ("clk: rockchip: Handle clock tree for rk3288w variant")
added the check for rk3288w-specific clock-tree changes but in turn would
require a double-compatible due to re-using the main rockchip,rk3288-cru
compatible as entry point.

The binding change actually describes the compatibles as one or the other
so adapt the code accordingly and add a real second entry-point for the
clock controller.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # rock-pi-n8
Link: https://lore.kernel.org/r/20200703154948.260369-1-heiko@sntech.de

drivers/clk/rockchip/clk-rk3288.c

@@ -15,6 +15,11 @@
 #define RK3288_GRF_SOC_CON(x)	(0x244 + x * 4)
 #define RK3288_GRF_SOC_STATUS1	0x284
 
+enum rk3288_variant {
+	RK3288_CRU,
+	RK3288W_CRU,
+};
+
 enum rk3288_plls {
 	apll, dpll, cpll, gpll, npll,
 };
@@ -922,7 +927,8 @@ static struct syscore_ops rk3288_clk_syscore_ops = {
 	.resume = rk3288_clk_resume,
 };
 
-static void __init rk3288_clk_init(struct device_node *np)
+static void __init rk3288_common_init(struct device_node *np,
+				      enum rk3288_variant soc)
 {
 	struct rockchip_clk_provider *ctx;
 
@@ -945,7 +951,7 @@ static void __init rk3288_clk_init(struct device_node *np)
 	rockchip_clk_register_branches(ctx, rk3288_clk_branches,
 				  ARRAY_SIZE(rk3288_clk_branches));
 
-	if (of_device_is_compatible(np, "rockchip,rk3288w-cru"))
+	if (soc == RK3288W_CRU)
 		rockchip_clk_register_branches(ctx, rk3288w_hclkvio_branch,
 					       ARRAY_SIZE(rk3288w_hclkvio_branch));
 	else
@@ -970,4 +976,15 @@ static void __init rk3288_clk_init(struct device_node *np)
 
 	rockchip_clk_of_add_provider(np, ctx);
 }
+
+static void __init rk3288_clk_init(struct device_node *np)
+{
+	rk3288_common_init(np, RK3288_CRU);
+}
 CLK_OF_DECLARE(rk3288_cru, "rockchip,rk3288-cru", rk3288_clk_init);
+
+static void __init rk3288w_clk_init(struct device_node *np)
+{
+	rk3288_common_init(np, RK3288W_CRU);
+}
+CLK_OF_DECLARE(rk3288w_cru, "rockchip,rk3288w-cru", rk3288w_clk_init);